The cycloaddition of 8-styrylcyclohepta[b]pyrroles with dimethyl acetylenedicarboxylate give the 7H-6a-azacyclobuta[j]cyclopenta[1,2,3-cd]azulene ring system, which rearranges thermally into the 3H-2a-azacyclopenta[cd]azulene ring system.
N. Abe and T. Nishiwaki, J. Chem. Soc., Chem. Commun., 1979, 476 DOI: 10.1039/C39790000476
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